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At an academically challenging high school, the average GPA of a high school senior is known to be normally distributed with a variance of 0.25. A sample of 20 seniors is taken and their average GPA is found to be 2.71. Assume that z0.05=1.645 and z0.1=1.282.The 90% confidence interval for the population mean GPA is: [2.6180, 2.8020] [2.5667, 2.8533] [2.6383, 2.7817] [2.5261, 2.8939]
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